Diphosphonate esters having dicarbamic acid diesters

ABSTRACT

New Dicarbamic acid diesters of the formula   in which the substituents have the meaning given in the disclosure, their manufacture and use as flameproofing agents of textiles, especially for cellulose containing fibres, paper and plactics.

1 Ow 1 3 a 1 2e LMQOQOeQ i -52 a United States P2 3,906,063

Hendricks et al. iept. 16, 1975 DIPHOSPHONATE ESTERS HAVING DICARBAMIC ACID DIESTERS Primary ExaminerAnton H. Sutto [75] Inventors: Udo-Winfried Hendricks, Cologne; Attorney Agent or Firm-mummy & Tyner Klaus Walz, Berg. Neukirchen, both of Germany [73] Assignee: Bayer Aktiengesellschaft, [57] ABSTRACT Leverkusen, Germany 22 Filed: May 17,1974

211 Appl. No.: 470,825

New Dicarbarni'c acid diesters of the formula R9 0 0 0 0 OR, [30] Foreign Application Priority Data g E I l Md) 19, 1973 Germany 2325576 R" R OR:

[52] U.S. Cl 260/932; 106/15 FP; 117/136; 260/927 R; 260/968; 260/969; 260/970 1 lllt- (II-2m C07F C07F 1306C 27/00 in which the substituents have the meaning given in of Search R, the disclosure their manufacture and use as flameproofing agents of textiles. especially for cellulose References cued containing fibres, paper and plactics.

UNlTED STATES PATENTS 2710.301 6/1955 Morris et al. 260/932 5 Claims, No Drawings DIPHOSPHONATE ESTERS HAVING DICARBAMIC ACID DIESTERS The invention relates to new dicarbamic acid diesters, containing phosphorus, of the formula R O O O O OR i R O N R N 0 R (I) I 00 R, R, 0R

in which R represents a C C,-alkylene radical which is optionally substituted by one or more halogen atoms, preferably chlorine atoms,

R, and R independently of one another represent a C,C -alkyl radical which is optionally substituted by halogen atoms, preferably chlorine atoms, or together with the oxygen atoms and the phosphorus atom form a S-membered to 7-membered heterocyclic structure,

R is hydrogen, a hydroxymethyl group or a C C- alkoxymethyl group, and

R is a CH(OH)CH(OH) or especially a in which R, R R and R have the meaning indicated under the formula I. These compounds, obtainable according to processes which are in themselves known, are reacted, again in a manner which is in itself customary, with aldehydes or compounds'which split off aldehyde.

As aldehydes there may above all be mentioned ali phatic C,C,;-monoaldehydes, such as formaldehyde, acetaldehyde, chloral, propionaldehyde, butyraldehyde, glyoxylic acid and its esters with C -alkanols, especially the methyl ester, and also aromatic aldehydes, such as benzaldehyde, monochlorobenzaldehyde, dichlorobenzaldehyde and trichlorobenzaldehyde, and the dialdehyde glyoxal. As compounds which split off aldehyde, paraformaldehyde. trioxane and formaldehyde-dimethylacetal can in particular be used.

Process A is carried out, for example, by dissolving the compounds of the formula II in water or mixtures of water with water-miscible organic solvents, for example alcohols, such as methanol and ethanol, or ketones, such as acetone, adding catalytic amounts of acid, for example hydrochloric acid or sulphuric acid,

and the aldehyde, to the solution, and storing the reaction mixture for several days at room temperature. The reaction time can be shortened by raising the temperature. The reaction of the compounds of the formula II with the aldehydes can also be carried out in an anhydrous medium, for example in water-immiscible organic solvents, such as benzene, toluene or xylene, and the water formed in the reaction can be distilled off azeotropically. In the case of the reaction of compounds of the formula II with glyoxal it is advisable to work in a neutral to weakly alkaline medium. In the case of using compounds of the formula II in which R represents hydrogen, the compounds of the formula I obtained from the reaction with the aldehydes can subsequently be methylolated with formaldehyde in an alkaline medium, and the methylol compounds can be etherified with a lower aliphatic C C,,-alcohol, for example methanol or ethanol, in an acid medium in a known manner.

Process B:

This starts from dicarbamic acid esters of the formula X represents a chlorine or bromine atom,

R represents a C C -alkylene radical and R represents a CH(R ')group in which R is hydrogen or a C,C -alkyl, aryl, carboxyl or C c alkoxycarbonyl group.

These compounds of the formula III are reacted with phosphorous acid trialkyl esters of the formula in which R,,, R and R, independently of one another represent a C C, alkyl radical or R and R; together with the oxygen atoms and the phosphorus atom form a S-membered to 7- membered heterocyelic structure, at lO0-2()OC, preferably l30l80C, optionally in the presence of diluents which are inert under the reaction conditions, and are optionally. subsequently methylolated with formaldehyde in the customary manner, and the resulting methylol compounds are optionally etherified with C C alkanols in a known manner.

As examples of representatives of the compounds of the formula III there may be mentioned N,N'-methylene-bis-(carbamic acid Z-chloroethyl ester), N,N-methylene-bis-(earbamic acid 2-bromoethyl ester), N,N-methylene-bis-(carbamic acid 2- chloropropyl ester), N,N'-methylene-bis-(carbamic acid 3-chloropropyl ester) and N,N'-methylene-bis- (carbamic acid Z-bromobutyl ester).

As examples of phosphorous acid trialkyl esters of the formula IV there may be mentioned: trimethyl phosphite, triethyl phosphite, tri-n-propyl phosphite, tri-iso-propyl phosphite, tri-iso-butyl phosphite, dimethyl-ethyl-phosphite, Z-methoxyl .3-dioxaphospholan and 2-ethoxy-4-methyll ,3-dioxaphospholan.

In a preferred embodiment of the process B, N,N-methylene-bis-(carbamic acid 2-chloroethyl es- 4 l()()-l40C. As radical-forming catalysts it is possible to use organic peroxides, for example dibenzoyl peroxide, di-tert.-butyl peroxide or dicumyl peroxide, or azo compounds, such as azo-isobutyric acid di-nitrile. The

is preferably carried out using excess phosphorous acid dialkyl ester at temperatures of 70-l6()C, preferably ter) or N,N-methylene-bis-(carbamic acid 2- 5 catalysts are employed in amounts of about 1-30 mol bromoethyl ester) is reacted with trimethyl phosphite based on the weight of the compounds of the foror triethyl phosphite, the product is subsequently opmula V. tionally methylolated with formaldehyde and the meth- In a preferred embodiment of the process C, ylol compounds are optionally etherified with metha- N,N'-methylene-bis-(carbamic acid allyl ester) or 1101- N,N-methylene-bis-(carbamic acid methallyl ester) is Process C: reacted with dimethyl phosphite or diethyl phosphite This starts from dicarbamic acid esters of the formula and the resulting dicarbamic acid ester is optionally subsequently methylolated with formaldehyde and the methylol compounds are optionally etherified with O 0 methanol. ll ll The compounds of the formula I in which R, R R R -OCT RIT C OR (V) R and R have the meaning indicated in the table a which follows may be mentioned as examples of representatives of the compounds of the formula [according in which to theinvention: I

Table -CH cH, -CH, H -cH; -;CH. CPl; -CH3 CH2-OCH;, --CH2 C2H,, c,|-|, H CH(OH)CH(OH)-- -CH -CH. CH,, CH, H CH -CH.;CH. CI'L CH;; -CH2OH --CH24 CH CH. CH CH -CH OCH CH CH, CH, cii cn, -cH ocH,, -CH(OH)CH(OH) cH, ci-i .1H -C H,, CH,ocH, .ICH. CH ca CH;, ci-i cH, ocH., cc|,, cH CH CH CH,, CH H CH;,OOC--CH -(CH2)3 -CH;, CH H y CH Z)=I CH. -CH., CVH2OH ci-|., CH C. .H,, -C H H .CH(OH)CH(OH) CH(CH;,)-CH. CH --CH,, -CH OH -CH. 'fla a -CH:; -CH- OCH;, CH2 (CH. CH CH;, CH OCH;, CH;,-CH -CH(CCI --CH, CH CH OCH CH CH CH CH. CH 'OCH -C Hv CHr .CH 'CH --CH --CH OCH -CH:

CH; CH --CH. .CH CH- CH- cH ocH,, CH

CH CH3 i BrCH -CHBrCH Cii CH CH. .0CH CH: CH. ,-CH2 -(H,, CH,, CH2OH. CH(C,;H,,)

R and R have the meaning indicated under the for- The compounds according to the invention, of the mula I and formula I, are in the majority of cases highly viscous, R represents a C -C alkenyl radical; colourless or pale-coloured liquids. They are outstandthese compounds of the formula V are reacted with ingly suitable for flameproofing fibre materials of natuphosphorous acid dialkyl esters of the formula ral or synthetic fibres, and plastics. An outstandingly 5O wash-resistant flame-proof finish is obtained with the Rflo O aid of the compounds according to the invention on \H textiles of fibre materials containing cellulose, such as (VI) cotton, linen, viscose and rayon and polyester-cotton R70 mixtures.

The dicarbamic acid diesters according to the invenin which tion,.of the formula I, are employed in an amount of R and R have the meaning indicated under the for about 8 to 60, preferably 10 to 40, /1 by weight based mula IV, on the fibre material, when used as flameproofing in the presence of radical-forming catalysts and are agents for textile materials. thereafter, if R;, represented hydrogen, optionally To carry out the finishing process, the textile materimethylolated with formaldehyde, and the methylol als are impregnated with solutions which contain, per compounds are optionally etherified with C,C litre, about 100-400;; of the compounds according to alkanols. the invention, of the formula I, and also, optionally, fur- The reaction of the compounds of the formula V with ther finishing agents, such as creaseproofing agents, the phosphorous acid dialkyl esters of the formula VI softeners, agents for conferring hydrophobic properties and agents for conferring oleophobic properties, and acid or latent acid condensation catalysts. The solvent used is preferably water, optionally mixed with watermiscible organic solvents, and optionally with the use of small amounts of emulsifiers. The fibre materials are impregnated with the finishing liquor in a known manner, for example by dipping, padding or spraying, squeezed out to a weight increase of about 80l50%, subsequently dried and thermofixed at 100-200C, preferably 140l80C.

The parts mentioned in the examples which follow are parts by weight unless otherwise stated.

EXAMPLE 1 25 parts of 38% strength formaldehyde solution and 1.5 ml of concentrated hydrochloric acid are added at room temperature to a solution of 145 parts of N- methoxymethy1-2-carbamyloxyethylphosphonic acid dimethyl ester, which has been prepared in a manner which is in itself known by reaction of 2-hydroxyethanephosphonic acid dimethyl ester with methoxymethyl isocyanate, in 180 ml of water. The reaction mixture is stored for 4 days at room temperature and subsequently first neutralised with sodium hydroxide solution and then freed from the water of reaction and the volatile constituents at 70C in a vacuum of about 2 mm Hg. 136 parts of the compound of the formula CH OCH C Hz n are obtained as a colourless, viscous liquid.

Calculated: 32.5% C; 5.9% H; 6.9% N; 15.8% P;

Found: 32.4% C; 5.9% H; 7.3% N; 15.1% P

The same compound was also prepared as follows:

114 parts of 2-carbamyloxyethane-phosphonic' acid dimethyl ester and 23.7 parts of 38% strength aqueous formaldehyde solution were mixed with 90 parts of water, with the addition of 1.5 ml of concentrated hydrochloric acid, and the mixture was stored for 4 days at room temperature. The reaction mixture was then neutralised with dilute sodium hydroxide solution and freed from water by warming in vacuo. The compound was obtained in a yield of l 18 parts, again as a colourless, highly viscous liquid.

Calculated: 32.5% C; 5.9% H; 6.9% N; 15.28% P;

Found: 31.6% C; 5.8% H; 5.7% N; 15.2% P

EXAMPLE 3 31 parts of dibenzoyl peroxide are added at room temperature to a solution of 645 parts of N,N'-methylene-bis-(carbamic acid allyl ester) in 1.980 parts of dimethyl phosphite and the mixture is then slowly introduced dropwise into a flask heated to ll35C. After completion of the addition, the reaction solution is first stirred at 130-l35C for 1 hour, then mixed with a further 31 parts of dibenzoyl peroxocH,

ocH,

ide, and again stirred for 5 hours at the same tempera- C H N O P (molecular weight 494); n,, 1.4650 35 ture. The excess dimethyl phosphite is then distilled off Calculated: 36.4% C; 6.5% H; 5.7% N; 12.5% P; Found: 35.8% C; 6.6% H; 5.8% N; 12.5% P

EXAMPLE 2 460 parts of trimethyl phosphite are added dropwise are obtained as a colourless, highly viscous liquid. C H N O P (molecular weight 406 ocH,

ocH

in vacuo (2 mm Hg) at 90C. 1,530 parts of the compound of the formula o o OCH ocH,

are obtained as a highly viscous, colourless liquid.

c gHzgNolopz (molecular weight 434); n,, 1.4649 Calculated: 35.9% C; 6.45% H; 6.45% N; 14.3% P; Found: 34.9% C; 6.5% H; 5.9% N; 14.9% P

EXAMPLE 4 mm Hg and then at 25 mm Hg. parts of the compound of the formula are obtained as a colourless, viscous liquid. n 14720.

. EXAMPLE 21 parts of 38% strength formaldehyde solution and 1.5 ml of concentrated hydrochloric acid are added to a solution of 1 l5 parts of N-methoxymethylcarbamyloxymethanephosphonic acid dimethyl ester in 9Q mlof "water at roomtemperature. The reaction mixture is stored for 4 days at room temperature, then neutralised with sodium hydroxide solution and freed from water and the volatile constituents in vacuo. 120 parts of the compound ofthe formula OCH cmo o cmocn, CHZOCHK are obtained a colourless, highly viscous liquid.

c gHggNgo -zpg (molecular weight: 466); n,, 1.480

Calculated: 33.5% C; 6.0% 1-1; 6.0% N; 13.1% P; Found: 32.0% C; 5.7% H; 6.2% N; 13.5% P

EXAMPLE 6- A solution of 175 parts of the compound described in Example 2in. 80 parts of water is adjusted. to pH 9 with sodium hydroxide solution and 50 parts of 38% strength formaldehyde solution are added at 6070C. After stirring for 1 hour at 6070C, the water is distilled off at 4050C ina vacuum which is initially 14-15 mm Hg and then 2-5 mm Hg. 190 parts of the compound CH2OH cH'goH OCH OCH are obtained as a colourless, highly viscous paste.

EXAMPLE 7 A cotton furnishing fabric is impregnated with an aqueous liquor which contains, per litre, 400 g of the dicarbamic acid diester described in Example 1, 150 g of a trimethylolated melamine, 25 g of magnesium chloride, 5 g of citric acid and l g of the reaction product ofl mol of nonyl phenol with mols of ethylene oxide. The impregnated fabric is squeezed out to a o oca,

weight increase of9()-100%, dried at 100C for 10 min- 3 utes and condensed at 1609C for 5 minutes. The fabric is then washed with a dilute sodium carbonate solution at 40C, and dried.

To test its flame-retardant finish, the fabric finished as described above is subjected to the vertical test according to DIN 53,906. The results'of the test are summarised in the table which follows: 7

Table Burning length Warp Weft A untreated burned away B finished according to 7.3 cm (1.0 cm

Example 7 6.6 cm 6.1 cm

C B, after 5 machine washes at the boil We claim:

1. Dicarbamic acid diestersof the formula :t :3 O 2 g in which I g R represents a C C -alkylene radical which is optionally substituted by one or more halogen atoms, R and R independently of one another represent a C C -alkyl radical which is optionally substituted atoms and the phosphorus atom form a 5- membered to b 7-membered heterocyclic structure, R3 represents hydrogen or a hydroxymethyl or C C, alkoxymethyl group'and -.CH(R F,') group, p r j in which R is hydrogen, an optionally halogen-substituted c, c,- a11 y1 group or aryl group, a carboxyl group 1,2-ethylene or 1,3-

wherein R is H or CH2.OH. V

5i Dicarbamic acid diesters according to claim 1 of the formula halogenatoms or together with, the oxygen diesters according to claim 1,

UNITED STATES PATENT AND TRADEMARK OFFICE CERTIFICATE OF CORRECTION PATENT NO. 3,906 ,063

DATED September 16, 1975 lN\/ ENTOR(S) Udo-Winfried Hendr et a1 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 5, Example 2, last line after "406" there should be I Column 6, line 15, "5.7%" should be Column 8 Claim '1, line 23 after to "b" should be deleted.

Signed and Scaled this twenty-fourth D :1 Of February I 9 76 [SEAL] A ttest:

RUTH C. MASON C. MARSHALL DANN AIH I'HK Of/YFP (ummissl'mrvr oj'larenrx and Trademarks 

1. DICARBAMIC ACID DIESTERS OF THE FORMULA
 2. Dicarbamic acid diesters according to claim 1, characteriSed in that R represents the methylene, 1,2-ethylene or 1,3-propylene radical, R1 and R2 represent methyl or ethyl and R4 represents the methylene radical.
 3. Dicarbamic acid diesters according to claim 1 and 2, characterised in that R represents the 1,2-ethylene or 1,3-propylene radical, R1 and R2 represent methyl or ethyl, R3 represents hydrogen, hydroxymethyl or methoxymethyl and R4 represents the methylene radical.
 4. Dicarbamic acid diesters according to claim 1 of the formula
 5. Dicarbamic acid diesters according to claim 1 of the formula 